Dust separator



y 1945* i w. R. APPELDOORN 2,375,203

' DUST SEPARATOR Filed Sept. 9, 1943 2 Sheets-Sheet 1 INVENTOR.

aamwvm ATTORNE Y8 May 8, 1945. w. R. APPELDOORN DUST SERARATOR Filed Sept. 9, 1943 2 Sheets-Sheet 2 INVENTOR. I William R. Amoaldoorn ATTORNEYS Patented May 8, 1945 STATES (Granted under the act of March 3, 1883, as amended April 30, 1928; 370 O. G. 757) 2 Claims.

The invention described herein may be manufactured and used by or for the Government for governmental purposes, without the payment to me of any royalty thereon.

The present invention pertains to a novel dustoutlet end. Air is drawn by a fan into the larger end and, by means of suitable whirler blades, is given a large rotational component. The diminishing means circumference of the passage acceleratesthe current and increases the centrifugal force which throws the particles outward. At the outlet the laden portion of the air is communicated to a scroll and discharged therefrom. The remainder of the air enters another chamber or duct having turning vanes which restore the stream from a whirling to a linear path. The removal of the tubulen'ce in this manner diminishes the kinetic energy of the air and likewise the power input requirement of the fan, as

described more fully hereinafter.

An illustrative embodiment .of the invention is described in the following specification and shown in the accompanying drawings in which:

Figure 1 is a longitudinal section of the device on the line l-! of Figure 2;

Figure 2 is a plan View, showing the housing in section;

Figure 3 is a section on the line 33 of Figure 2, and

Figure 4 is an end view.

The apparatus is built within a housing includin a cylindrical outer wall i from one end of which extends a converging conical wall 2. Within the cylindrical wall is mounted a fan rotor 3 driven by a motor 3 and carrying at its periphery a cylinder 4 concentric with and spaced from the wall I. The cylinder 4 is not co-extensive with the wall I towards the wall 2, and the intervening space. is occupied by a fixed cylindrical wall 5 held by a suitable partition 6. At the opposite end, the wall 4 is formed with an inwardly directed curved lip I over which air flows to the chamber 8 between the cylinders I and 4. In this chamber a number of suitably shaped fan blades 9 are carried by the wall t and are designed to draw air into the chamber 8.

The annular chamber l0 between the cylindrical walls I and 5 contains a number of suitably curved whirler blades ll secured preferably to the inner surface of the wall I. The blades are designed to increase the rotational component of the air stream and to discharge it with a whirling motion. From the wall 5 another conical wall l2 extends within and parallel to the wall 2 and forms therewith a tapering chamber l3 in which the whirling stream is accelerated.

At the smaller or discharge end of the chamber I3 is built a scroll it joining the smaller end of the conical wall 2 at the point l5. The scroll is coaxial with the rotor 3 so that. the direction of flow therein is transverse of the chamber l3. No substantial change of direction occurs in the transfer of air from the chamber l3 to the scroll, due to the large whirling or rotational component of the stream in the chamber l3.

A cylindrical wall l6 extends from the smaller,

end of the conical wall 12, and around the wall it is spaced a concentric wall I'l flaring in the outward direction. A comparatively small space it is retained between the walls 2 and H for a purpose which will presently appear. In the cham-. ber l9 between the walls [6 and H are mounted turning vanes 20 designed to direct the air from the chamber l3 into a substantially linear path.

In the operation of the device the dirt particles in the whirling air in the chamber l3 are thrown towards the wall .2 by centrifugal force. The space i8 is dimensioned to passabout 20 per cent of the totalair from the chamber l3 to the scroll it. This air, being the outer fraction, carries practically all of the dirt and is discharged from the outlet 2i of the scroll as shown in Figure 4. The remaining, clean air is discharged from the larger end of the chamber l9 into the space or apparatus where it is to be used. This air, being relieved of its turbulence, is also relieved of much of its kinetic energy. Consequently, the power input requirement at the fan is less, for a given volume of air, than if the discharged air were allowed to remain turbulent, and the efficiency of the apparatus is thereby improved. One of the characteristics contributing to the compactness of the apparatus is the converging chamber l3 wherein the air is accelerated and the centrifugal force increased for more efficient separation of the solid particles, While a specific embodiment of the invention has been illustrated and described, it is intended that various alterations in the details of con-,

struction may be made without departing from the invention as indicated by the scope or the appended claims:-

What Iclaim is: i I l. A dust separator comprising a housing having a conical wall, a core, within said housin having a conical wall spaced from and parallel to said core, a fan blade on said motor and within the conical wall or said housing and cooperating therewith to form an annular tapering passage oi gradually decreasing cross-sectional area, a fan at the larger end of said passage for drawing air thereinto whirler blades adjacent the discharge side of said fan to impart a whirling motion to the air to throw the dust particles in the air radially outwardly in the passage, a scroll at the smaller end 01' the conical wall of said housing, said scroll having an annular opening communicating with the outer portion of the annular tapering passage to receive dust laden air, a double walled structure within said scroll and communicating with the inner portion of said passage, and turning vanes in said structure adapted to redirect the whirling air into a linear path.

2. A dust separator comprising a housing havinga cylindrical wall and a conical wall oi desaid cylindrical wall for drawing air into said passage, whirler blades adjacent the discharge side' of said fan blade to impart a whirling motion to the air to throw the dust particles in the air radially outwardly in the passage, a scroll at the smaller end of the conical wall of said housing, said scroll having an annular opening communicating with the 'outer portion of the annular tapering passage to receive dust laden air, a cylindrical wall extending'irom the smaller end of the conical wall of said core, a shell surrounding said last mentioned cylindrical wall and spaced therefrom to form an annular passage communicating with the radially inner portion of the tapering passage between the two conical walls, and turning vanes in said last defined passage adapted to redirect the whirling air into a linear path.

. M R. APPEIDOO 

